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Last time I found in my new, old plane that there is different than other engines fuel circuit.
In my is no return line. I have wather separator, mechanical fuel pump, T splitter for 2 carbs and that's all.
Is this known solution or maybe incorrect modyfication of previous owner?
Engine work's good, there is no problem's. What can be wrong without return line?
Photo beside.
DSC_7515copy.jpg (You do not have access to download this file.)
  • Re: No return line in fuel circuit?

    by » 11 years ago


    I have no electric pump ( wing's tanks are higher than engine).
    In one tank i saw two hoses (I think that one is return line) but I have no idea where it's connected.

  • Re: No return line in fuel circuit?

    by » 11 years ago


    the fuel return line was not mandatory before (approximately) 2002 and many aircraft builders ignored it anyways with no ill effects. I would install a return line as you are using a Corona pump.
    I am worried about some of the other things visible:
    -your oil cooler is upside down. it will trap air with the fitting downwards.
    -No firesleeve on the fuel or oil hoses.
    -fuel lines tied to ignition wires? hard to see if they have stand-offs.
    -No master relay? You have a huge, hot wire going into the cabin?
    -No cover on the battery positive terminal.
    I hate to be picky but I believe these are important things. you should service your air filters also.

  • Re: No return line in fuel circuit?

    by » 11 years ago


    I agree with Rob after looking at the picture.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: No return line in fuel circuit?

    by » 11 years ago


    -your oil cooler is upside down. it will trap air with the fitting downwards.

    -No firesleeve on the fuel or oil hoses.
    Yee.. I'm going to buy them when fuel lines replacing

    -fuel lines tied to ignition wires? hard to see if they have stand-offs.
    I'm using stand-offs made from 0,5cm of rubber hose - it is correct?

    -No master relay? You have a huge, hot wire going into the cabin?
    There is starter relay only. I have huge "mass" wire going into cabin "mass cutter" and next quite smaller to master switch. It is popular technique in TL aeroplanes. I'm not sure if it's goos (a lot of copper) but there is..

    -No cover on the battery positive terminal.
    Yes, need some.

  • Re: No return line in fuel circuit?

    by » 11 years ago


    I got this corona pump with rotax service kit. I know that this have 200h TBO, there is any issues related with this pumps?

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